Sealing device for feeding cover and discharging cover of rotary kiln

Abstract

The utility model relates to the technical field of rotary kilns, in particular to a sealing device for a feeding cover and a discharging cover of a rotary kiln, which is characterized in that a first sealing body is provided with a sealing convex ring, a second sealing body is provided with a sealing groove and a spring seat, the spring seat is provided with a plurality of guide rods, the guide rods are sleeved with springs, the springs are limited between the spring seat and the second sealing body, and under the tension of the springs, the sealing convex ring can seal the feeding cover and the discharging cover of the rotary kiln. And the second sealing body is pushed to move towards the first sealing body, so that the sealing convex ring is attached into the sealing groove. When the cylinder body axially moves due to thermal expansion and cold contraction or the sealing convex ring and the sealing groove are worn due to long-term use, under the tension action of the spring, the second sealing body is pushed to move towards the first sealing body, the gap is automatically compensated, the sealing convex ring is tightly attached to the interior of the sealing groove, it is ensured that the sealing faces are attached all the time, and the leakage rate is reduced to 0.3% or below.

Description

Technical Field

[0001] This utility model relates to the field of rotary kiln technology, specifically to a rotary kiln inlet and outlet sealing device. Background Technology

[0002] Rotary kilns are widely used in various industrial fields. During the operation of a rotary kiln, the feed hood and discharge hood do not rotate with the kiln body. In order to maintain a stable atmosphere inside the rotary kiln, sealing devices are usually installed between the kiln body and the feed and discharge hoods.

[0003] This type of sealing device typically employs a planar sealing method, where a planar sealing ring installed on the kiln body fits tightly against the end faces of the inlet and outlet hoods. When the kiln rotates, the planar sealing ring rotates against the kiln body end faces, thus achieving a sealing effect. However, due to axial movement caused by thermal expansion and contraction during operation, and the wear of the sealing ring after prolonged use, a good fit between the sealing ring and the inlet and outlet hood end faces is often lost. This leads to high-temperature gas leakage, with leakage rates reaching as high as 5%-15%, increasing energy consumption and causing environmental pollution. Utility Model Content

[0004] To address this issue, the present invention provides a rotary kiln inlet and outlet hood sealing device, which solves the technical problem in the prior art where the kiln body moves axially due to thermal expansion and contraction, and the sealing ring is prone to wear after long-term use, resulting in the sealing ring and the inlet and outlet hood end faces not maintaining a good fit, thus causing high-temperature gas leakage.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A rotary kiln inlet and outlet hood sealing device includes an installation flange for the rotary kiln inlet and outlet hoods. The inlet and outlet hoods include a cylindrical fixed seat coaxially and rotatably fitted onto the outer periphery of the rotary kiln body near the inlet and outlet hoods. The fixed seat is fixedly connected to the installation flange. A cylindrical first sealing body is fixedly connected to the fixed seat on the side away from the inlet and outlet hoods. The first sealing body is rotatably fitted onto the outer periphery of the rotary kiln body. A raised annular sealing ring is provided on the side of the first sealing body away from the fixed seat. A cylindrical spring seat is fixedly fitted onto the outer periphery of the rotary kiln body on the left side of the first sealing body. A cylindrical second sealing body is slidably fitted between the spring seat and the first sealing body. The second sealing body has an opening on its outer side facing the first sealing body. The sealing convex ring is adapted to an annular sealing groove, with a support hole on its inner side; the support hole wall has a semi-circular annular support groove; a sealing ring is fixedly sleeved on the outer periphery of the rotary kiln cylinder inside the support hole; an annular flexible support ring is fixedly sleeved on the outer periphery of the sealing ring; a semi-circular sealing part adapted to the support groove is provided on the top of the support ring; the sealing part is embedded in the support groove; multiple guide rods are evenly distributed radially on the side of the spring seat facing the second sealing body; springs are sleeved on the guide rods; one end face of the spring contacts the right side face of the spring seat, and the other end face contacts the left side face of the second sealing body. Under the tension of the spring, the second sealing body is pushed to move towards the first sealing body, so that the sealing convex ring fits into the sealing groove.

[0007] Preferably, a wear-resistant ring is provided at the top of the sealing convex ring or at the bottom of the sealing groove.

[0008] Optionally, the wear-resistant ring is made of polyetheretherketone (PEEK).

[0009] Preferably, a second annular O-ring is provided between the fixing seat and the first sealing body.

[0010] Optionally, both the second O-ring and the sealing ring are made of perfluoroether rubber material.

[0011] Preferably, the fixed seat has an embedding hole on the side away from the mounting flange; the first sealing body is disposed in the embedding hole; the sealing convex ring extends out of the embedding hole; an end cap is rotatably sleeved on the outer periphery of the rotary kiln shell on the left side of the spring seat; the end cap is fixedly connected to the fixed seat; a placement hole is provided on the side of the end cap facing the fixed seat; the sealing convex ring, the second sealing body, and the spring seat are all located in the placement hole; the wall of the placement hole is provided with a purge pipe communicating with it for injecting low-pressure inert gas.

[0012] Preferably, the bottom of the purge tube is located above the sealing convex ring.

[0013] Preferably, the fixing seat, the first sealing body, the second sealing body, the spring seat, and the end cap are all assembled from two semi-circular splicing bodies.

[0014] Preferably, an annular first O-ring is provided between the fixing seat and the end cover.

[0015] Optionally, the first O-ring is made of perfluoroether rubber.

[0016] Preferably, an annular sealing gasket is provided between the mounting flange and the fixing seat.

[0017] This utility model has at least the following beneficial effects:

[0018] The system features a sealing ring on the first sealing body, a sealing groove on the second sealing body, and a spring seat. Multiple guide rods are mounted on the spring seat, and springs are fitted onto the guide rods. The springs are confined between the spring seat and the second sealing body. Under spring tension, the second sealing body moves towards the first sealing body, causing the sealing ring to fit into the sealing groove. During thermal expansion and contraction of the cylinder, or during long-term wear of the sealing ring and sealing groove, the spring tension pushes the second sealing body towards the first sealing body, automatically compensating for the gap and ensuring the sealing ring remains tightly fitted into the sealing groove. This ensures the sealing surfaces are always in contact, reducing the leakage rate to below 0.3%.

[0019] Therefore, the rotary kiln inlet and outlet hood sealing device of this utility model has the advantages of dynamic pressure adaptive adjustment, automatic compensation for gaps caused by kiln body thermal deformation and seal wear, ensuring that the sealing surface is always in contact, and reducing leakage rate. Attached Figure Description

[0020] To more clearly illustrate the prior art and the present invention, the accompanying drawings used in the description of the prior art and the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other drawings from the provided drawings without any creative effort.

[0021] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which this utility model can be implemented. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0022] Figure 1 This is a front sectional view of a rotary kiln inlet and outlet sealing device according to the present invention.

[0023] Figure 2 This utility model relates to a sealing device for the inlet and outlet hoods of a rotary kiln. Figure 1 A magnified view of part A;

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Fixed base; 101. Embedded hole; 2. First sealing body; 201. Sealing protrusion ring; 3. Second sealing body; 301. Sealing groove; 302. Support groove; 303. Support hole; 4. Spring seat; 5. Guide rod; 6. Spring; 7. Sealing ring; 8. Support ring; 801. Sealing part; 9. Wear-resistant ring; 10. End cap; 1001. Placement hole; 11. Purge pipe; 12. First O-ring seal; 13. Second O-ring seal; 14. Sealing gasket; 15. Mounting flange; 16. Rotary kiln shell. Detailed Implementation

[0026] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] In the description of this application: unless otherwise stated, "a plurality of" means two or more. The terms "first," "second," "third," etc., in this application are intended to distinguish the objects referred to and do not have any special meaning in terms of technical connotation (e.g., they should not be construed as an emphasis on importance or order). Expressions such as "comprising," "including," and "having" also mean "not limited to" (certain units, components, materials, steps, etc.).

[0028] The terms used in this application, such as "upper," "lower," "left," "right," and "middle," are generally used to facilitate intuitive understanding by referring to the accompanying drawings, and are not absolute limitations on the positional relationships in the actual product. Changes in these relative positional relationships, without departing from the technical concept disclosed in this application, should also be considered within the scope of this application.

[0029] This utility model provides a rotary kiln inlet and outlet sealing device, such as... Figure 1 , Figure 2As shown, rotary kiln inlet and outlet hoods are typically equipped with mounting flanges 15. The sealing device of this application includes a cylindrical fixing seat 1 coaxially and rotatably fitted onto the outer periphery of the rotary kiln body 16 near the inlet and outlet hoods. Specifically, a first mounting hole with a through-hole larger than the diameter of the rotary kiln body 16 can be opened in the fixing seat 1, through which the fixing seat 1 is fitted onto the rotary kiln body 16. The fixing seat 1 is fixedly connected to the mounting flange 15. A cylindrical first sealing body 2 is fixedly connected to the side of the fixing seat 1 away from the inlet and outlet hoods. The first sealing body 2 is rotatably fitted onto the outer periphery of the rotary kiln body 16. Specifically, a second mounting hole with a through-hole larger than the diameter of the rotary kiln body 16 can be opened in the first sealing body 2, through which the first sealing body 2 is fitted onto the rotary kiln body 16. A raised annular sealing ring 201 is provided on the side of the first sealing body 2 away from the fixing seat 1. A cylindrical spring seat 4 is fixedly fitted around the outer periphery of the rotary kiln shell 16 on the left side of the first sealing body 2. Specifically, a third mounting hole with a through hole diameter matching the diameter of the rotary kiln shell 16 can be opened in the spring seat 4. The spring seat 4 is fitted onto the rotary kiln shell 16 through the third mounting hole. They can be interference-fitted, or the spring seat 4 can be fixed to the rotary kiln shell 16 by fixing bolts. A cylindrical second sealing body 3 is slidably fitted between the spring seat 4 and the first sealing body 2. Specifically, a third mounting hole with a through hole diameter slightly larger than the diameter of the rotary kiln shell 16 can be opened in the second sealing body 3. The second sealing body 3 is fitted onto the rotary kiln shell 16 through the third mounting hole. An annular sealing groove 301 matching the sealing protrusion 201 is opened on the outer side of the second sealing body 3 facing the first sealing body 2, and a support hole 303 is opened on the inner side. A semi-circular annular support groove 302 is formed in the wall of the support hole 303. A sealing ring 7 is fixedly fitted around the outer periphery of the rotary kiln cylinder 16 inside the support hole 303. An annular support ring 8 is fixedly fitted around the outer periphery of the sealing ring 7. The support ring 8 is made of a flexible sealing material, such as a special rubber part. It can swing left and right and can also provide support and sealing. The top of the support ring 8 is provided with a semi-circular sealing part 801 that is adapted to the support groove 302. The sealing part 801 is embedded in the support groove 302 and plays a sealing role. Multiple guide rods 5 are evenly distributed radially on the side of the spring seat 4 facing the second sealing body 3. Springs 6 are sleeved on the guide rods 5. One end face of the spring 6 contacts the right side of the spring seat 4, and the other end face contacts the left side of the second sealing body 3. Under the tension of the spring 6, the second sealing body 3 is pushed to move towards the first sealing body 2, so that the sealing convex ring 201 fits into the sealing groove 301. In this way, when the cylinder moves axially due to thermal expansion and contraction, or when the sealing ring 201 and sealing groove 301 wear out after long-term use, the second sealing body 3 is pushed to move towards the first sealing body 2 under the tension of the spring 6, automatically compensating for the gap, so that the sealing ring 201 is tightly fitted in the sealing groove 301, ensuring that the sealing surface is always in contact, and reducing the leakage rate to below 0.3%.

[0030] Preferably, to reduce wear, a wear-resistant ring 9 is provided at the top of the sealing convex ring 201 or at the bottom of the sealing groove 301. The wear-resistant ring 9 is preferably made of polyetheretherketone (PEEK) material, which has a low coefficient of friction of 0.34 and self-lubricating properties that reduce wear.

[0031] Preferably, to prevent leakage between the fixing seat 1 and the first sealing body 2, an annular second O-ring 13 is provided between the fixing seat 1 and the first sealing body 2. Both the second O-ring 1 and the sealing ring 7 are preferably made of perfluoroelastomer rubber (FFKM), an upgraded version of fluororubber, which is temperature resistant from -20℃ to 325℃, maintains the elastic characteristics of rubber even at 300℃ for extended periods, has extremely strong acid and alkali resistance, and is wear-resistant.

[0032] Preferably, to prevent dust from entering the sealing surface, the side of the fixed seat 1 away from the mounting flange 15 has an embedding hole 101. The first sealing body 2 is disposed in the embedding hole 101, and the sealing convex ring 201 extends out of the embedding hole 101. An end cap 10 is rotatably fitted around the outer periphery of the rotary kiln shell 16 on the left side of the spring seat 4, as described above regarding the fixed seat 1. The end cap 10 is fixedly connected to the fixed seat 1. A placement hole 1001 is provided on the side of the end cap 10 facing the fixed seat 1. The sealing convex ring 201, the second sealing body 3, and the spring seat 4 are all located in the placement hole 1001. The wall of the placement hole 1001 is provided with a purge pipe 11 communicating with it for injecting low-pressure inert gas. The low-pressure inert gas forms an air curtain protective layer, preventing dust from entering the sealing surface, so that the powder and gas in the rotary kiln have almost zero leakage.

[0033] Preferably, to automatically remove dust from the sealing surface, the bottom of the purge pipe 11 is located above the sealing ring 201. When removing dust, purge gas is introduced into the purge pipe 11, and the purge gas blows the dust off.

[0034] Preferably, for ease of installation, the fixing base 1, the first sealing body 2, the second sealing body 3, the spring seat 4, and the end cover 10 are all assembled from two semi-circular splicing bodies. This splicing structure facilitates installation and disassembly, minimizes downtime during maintenance and component replacement, improves efficiency, and reduces time costs.

[0035] Preferably, to prevent leakage of low-pressure inert gas, a first annular O-ring 12 is provided between the fixing base 1 and the end cover 10. The first O-ring 12 is preferably made of perfluoroether rubber FFKM material.

[0036] Preferably, to prevent leakage between the device and the mounting flange 15 when installed, an annular sealing gasket 14 is provided between the mounting flange 15 and the fixed seat 1. The sealing gasket 14 is also preferably made of perfluoroether rubber FFKM material.

[0037] The present application has been described in a relatively specific and detailed manner above through general descriptions and specific embodiments. It should be understood that, based on the technical concept of the present application, several conventional adjustments or further innovations can be made to these specific embodiments; however, as long as they do not depart from the technical concept of the present application, the technical solutions obtained by these conventional adjustments or further innovations also fall within the protection scope of the claims of the present application.

Claims

1. A sealing device for the inlet and outlet hoods of a rotary kiln, wherein the inlet and outlet hoods of the rotary kiln are provided with mounting flanges (15), characterized in that, The system includes a cylindrical fixed seat (1) that is coaxially rotatably fitted around the outer periphery of the rotary kiln body (16) near the inlet and outlet hoods; the fixed seat (1) is fixedly connected to the mounting flange (15); a cylindrical first sealing body (2) is fixedly connected to the fixed seat (1) away from the inlet and outlet hoods; the first sealing body (2) is rotatably fitted around the outer periphery of the rotary kiln body (16); and a protruding ring is provided on the side of the first sealing body (2) away from the fixed seat (1). A cylindrical spring seat (4) is fixedly fitted around the outer periphery of the rotary kiln cylinder (16) on the left side of the first sealing body (2); a cylindrical second sealing body (3) is slidably fitted between the spring seat (4) and the first sealing body (2); the second sealing body (3) has an annular sealing groove (301) adapted to the sealing ring (201) on the outer side of the side facing the first sealing body (2), and a support hole (303) is provided on the inner side; The support hole (303) has a semi-circular annular support groove (302) on its wall; a sealing ring (7) is fixedly fitted around the outer periphery of the rotary kiln cylinder (16) inside the support hole (303); a flexible annular support ring (8) is fixedly fitted around the outer periphery of the sealing ring (7); a semi-circular sealing part (801) adapted to the support groove (302) is provided on the top of the support ring (8); the sealing part (801) is embedded in the support groove (302); multiple guide rods (5) are evenly distributed radially on the side of the spring seat (4) facing the second sealing body (3); a spring (6) is fitted on the guide rod (5); one end face of the spring (6) contacts the right side of the spring seat (4), and the other end face contacts the left side of the second sealing body (3). Under the tension of the spring (6), the second sealing body (3) is pushed to move towards the first sealing body (2), so that the sealing convex ring (201) fits into the sealing groove (301).

2. The rotary kiln inlet and outlet hood sealing device according to claim 1, characterized in that, A wear-resistant ring (9) is provided at the top of the sealing convex ring (201) or at the bottom of the sealing groove (301).

3. The rotary kiln inlet and outlet hood sealing device according to claim 2, characterized in that, The wear-resistant ring (9) is made of polyetheretherketone (PEEK).

4. The rotary kiln inlet and outlet hood sealing device according to claim 1, characterized in that, A second annular O-ring (13) is provided between the fixed seat (1) and the first sealing body (2).

5. The rotary kiln inlet and outlet hood sealing device according to claim 4, characterized in that, The second O-ring (13) and the sealing ring (7) are both made of perfluoroether rubber material.

6. A rotary kiln inlet and outlet hood sealing device according to any one of claims 1 to 5, characterized in that, The fixed seat (1) has an embedding hole (101) on the side away from the mounting flange (15); the first sealing body (2) is disposed in the embedding hole (101); the sealing convex ring (201) extends out of the embedding hole (101); the rotary kiln body (16) on the left side of the spring seat (4) is rotatably fitted with an end cap (10); the end cap (10) is fixedly connected to the fixed seat (1); the end cap (10) has a placement hole (1001) on the side facing the fixed seat (1); the sealing convex ring (201), the second sealing body (3), and the spring seat (4) are all located in the placement hole (1001); the wall of the placement hole (1001) is provided with a purge pipe (11) communicating with it for injecting low-pressure inert gas.

7. A rotary kiln inlet and outlet hood sealing device according to claim 6, characterized in that, The bottom of the purge tube (11) is located above the sealing ring (201).

8. A rotary kiln inlet and outlet hood sealing device according to claim 6, characterized in that, The fixed seat (1), the first sealing body (2), the second sealing body (3), the spring seat (4), and the end cap (10) are all spliced ​​together from two semi-circular splicing bodies.

9. A rotary kiln inlet and outlet hood sealing device according to claim 6, characterized in that, An annular first O-ring (12) is provided between the fixed base (1) and the end cap (10).

10. A rotary kiln inlet and outlet hood sealing device according to claim 9, characterized in that, The first O-ring (12) is made of perfluoroether rubber material.

11. A rotary kiln inlet and outlet hood sealing device according to claim 6, characterized in that, An annular sealing gasket (14) is provided between the mounting flange (15) and the fixing seat (1).

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